Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Discussion about old sound cards, MIDI devices and sound related accessories.

Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2018-9-12 @ 08:12

Giving away my second Tandy card - thread here: viewtopic.php?f=5&t=62382
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby Scali » 2018-9-12 @ 16:52

This is from my Lo-tech card with SN76489 chip: https://youtu.be/WD8snfTl8iI
Sadly the recording is very soft, but you can hear that the noise channel sounds pretty much 'correct', and different from yours.
I used the MODIAC.EXE patched version found on oldskool.org (so Maniac Mansion v1).
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2018-9-12 @ 18:13

Yeah, the V1 modiac.exe sounds correct on my card as well. The enhanced version sounds weird...
Soldering, retro game reviews and more on YouTube and Bonus videos
Me playing games on my 286 and on my Sega MD2 on Twitch
80286@12 MHz, 2 MiB RAM, Tseng ET4000 1 MiB, schlae AdLib, PC MIDI Card + SC55MkII, XT CF Lite, OSSC 1.6
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby Scali » 2018-9-12 @ 18:20

root42 wrote:Yeah, the V1 modiac.exe sounds correct on my card as well. The enhanced version sounds weird...


Yea, I just tried it, it sounds strange indeed.
I didn't know there were two versions, and that they are so different, both in graphics and audio.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2018-9-12 @ 18:33

New test: Zak McKracken V1

https://youtu.be/RYj5HdMNCpA
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2018-9-13 @ 10:32

set your sn76489 output level lower to reduce noise level.

i already added some fixes to get the noise down in new version.
trying also to supply all ic's with own supply.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby Great Hierophant » 2018-9-14 @ 12:50

The differences between a true TI SN96489/96 and a clone NCR8496 or Tandy PSSJ are discussed here :

http://nerdlypleasures.blogspot.com/201 ... -chip.html

I assume everyone is using TI marked chips in their cards, but different chips appear to exhibit different behavior. As I indicated in that article, early Tandys can have the TI chips, but the majority of Tandy 1000s have chips with the NCR behavior. Whether you will get chips with the NCR behavior appears to be a roll of the dice.
http://nerdlypleasures.blogspot.com/ - Nerdly Pleasures - My Retro Gaming, Computing & Tech Blog
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby carlostex » 2018-9-15 @ 05:13

I noticed the problem with the noise channel when i was patching the games.

Maniac Mansion v1 works correctly because ripsaw8080 found a way to fix the noise channel via the patch. I don't remember the details though.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2018-9-16 @ 18:05

Well, maybe we can diff the EXEs or ask ripsaw8080 then...? :)
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2018-9-18 @ 15:29

i spend half the day rewiring my prototyp card and trying different approaches to make it less noisy.
it seems i had some success and full reroute is in progress,
also optimizing the card for "building kits" is in progress,
Placing all capacitors in same direction and ic's.. :)
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2018-9-18 @ 16:24

And can you make it compatible with the Keystone bracket? :)
Soldering, retro game reviews and more on YouTube and Bonus videos
Me playing games on my 286 and on my Sega MD2 on Twitch
80286@12 MHz, 2 MiB RAM, Tseng ET4000 1 MiB, schlae AdLib, PC MIDI Card + SC55MkII, XT CF Lite, OSSC 1.6
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2018-9-26 @ 17:01

Keystone Bracket ?
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2018-9-26 @ 17:10

This one:

https://www.digikey.de/product-detail/d ... -ND/608463

Readily available, and one simply need to drill a hole for the audio jack...
Soldering, retro game reviews and more on YouTube and Bonus videos
Me playing games on my 286 and on my Sega MD2 on Twitch
80286@12 MHz, 2 MiB RAM, Tseng ET4000 1 MiB, schlae AdLib, PC MIDI Card + SC55MkII, XT CF Lite, OSSC 1.6
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2018-9-26 @ 17:16

in future it will also need a Hole for a volume knob ;)
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2018-9-26 @ 17:25

matze79 wrote:in future it will also need a Hole for a volume knob ;)


Also possible. For the Adlib it was the same.
Soldering, retro game reviews and more on YouTube and Bonus videos
Me playing games on my 286 and on my Sega MD2 on Twitch
80286@12 MHz, 2 MiB RAM, Tseng ET4000 1 MiB, schlae AdLib, PC MIDI Card + SC55MkII, XT CF Lite, OSSC 1.6
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2018-10-07 @ 11:26

Wow

there is software for pcm playback on sn76489 :)

ftp://ftp.oldskool.org/pub/tvdog/tandy1 ... gimidi.zip
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby Scali » 2018-10-07 @ 12:10

matze79 wrote:Wow

there is software for pcm playback on sn76489 :)


Heh, the whole reason for my VGMPlay experiments was to get the PCM samples in some Sega games to play back correctly on a real 8088 with SN76489:
https://www.youtube.com/watch?v=gDMTU5nW0mE

And then the Skate or Die music:
https://www.youtube.com/watch?v=ARE6Bzs7Aj4
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby JonSmith » 2018-10-07 @ 21:40

I am very much looking forward to buying one of these boards from you when they are finished!
It would be great if I could also buy one of those lotech isa compactflash pcbs from you together with the other board, if that is possible!
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2018-10-12 @ 07:45

A friend of mine made another ISA bracket for the sound card:

Tandy_Isa_Bracket.stl.zip
(4.47 KiB) Downloaded 2 times


Its advantage is that it is one piece and can be mounted with small screws and nuts.

I am using it on my own board:

BDA72080-945A-425D-9B9E-26FEBF7B49E0.jpeg
Soldering, retro game reviews and more on YouTube and Bonus videos
Me playing games on my 286 and on my Sega MD2 on Twitch
80286@12 MHz, 2 MiB RAM, Tseng ET4000 1 MiB, schlae AdLib, PC MIDI Card + SC55MkII, XT CF Lite, OSSC 1.6
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2018-10-19 @ 11:05

Yeah nice, i had no time until now to continue with development but for future version there will be two volume knobs on the Backside, one for PC-Speaker and one for Volume.

Dreamblaster send me 3,5mm Audio Jacks with Screw, so i simply could mount the bracklet this way :)
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